SDR UALA2010051201612

Service difficulty report · Switch · Boeing 767322

Difficulty date: May 12, 2010
Submitted: May 14, 2010
Operation: Air carrier
Aircraft: N642UA
Make and model: Boeing 767322
Aircraft serial: 25092
Aircraft time: 82,111 hours, 13,194 cycles
Engine: Pwa PW4060
System (JASC): 2920 · Hydraulic System, Auxiliary
Part: Switch
Part number: 6510
Part serial: 35
Condition: Faulty
Location: Hydraulic Sys
Stage of operation: IN
How discovered: O
Nature of condition: O
Precautionary procedure: O

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

RAT UNLOCKED DURING APU BUS PRIORITY CHECK. REPLACED AIRSPEED SWITCH S614 IAW 767 MM AND WDW, PERFORMED RAT DROP IAW 767 MM. OPS TEST GOOD. TROUBLESHOOTING HISTORY, FIRST REPLACED K235 RELAY PER FIM AND WDM, NO HELP. REMOVED CONNECTOR D10434P AND FOUND PINS 1&2 BAD, CAUSING SWITCH TO CLOSE WITH PRESSURE TO 40 KTS. REPLACED AIRSPEED SWITCH S614 PER WDM. SWITCH BAD FROM STOCK. REPLACED S614 AGAIN, AND OPS TEST GOOD PER MM.